Crafted from aluminum , this tripod collar features a 71mm or 82mm rings diameter and a 4.5mm thickness, designs to secure your lens firmly Enhances your photography with this .8 Lens Tripod Collar, a must get accessory for achieving stable and balanced shot The tripod mount rings with its standard 1/4inch threading easily attaches to tripods, enhancing this 70 200mm .8 lens functionality for Multifunction conditions Suitable for photography enthusiasts and professional photographers who demand precisions and stability in their work Excellent for outdoor travel photography, and wedding event where a Stable hand is essential for capturing those unforgettable moment